No self respecting New Year's Eve bash would go forward without a high-profile celebrity on board to provide the hosting duties. This year was no exception.
Las Vegas was a hot spot with Snooki appearing at the Palms. A decidedly-slim Pamela Anderson got top billing at MGM Grand's Studio 54.
The Kardashian family worked the Sin City strip, with Kim Kardashian hosting at the Venetian nightclub Tao. Kourtney Kardasian and Scott Disick were stunning in black as they hosted down the street at Paris Hotel and Casino's Chateau nightclub. Holly Madison took in the action at Chateau too.
Lady Gaga and Justin Bieber were at Times Square as the headliners at Dick Clark's Rockin' Eve. The songstress helped Mayor Michael Bloomberg drop the iconic ball and then sealed the deal with a kiss - pics and video here.
Fergie and Josh Duhamel hit the red carpet at The Mirage in Vegas. She did the NYE west coast countdown from 1 OAK.
Check out more photos after the jump. We made a couple of observations ... Kim K has put on some weight and Snooki appears to be seconds away from a major wardrobe malfunction: